Circuit breaker including undervoltage release mechanism and...

Details Circuit breaker including undervoltage release mechanism and... Circuit breaker including undervoltage release mechanism and...

H - Electricity

02

H

348/39, 306/74

H02H 3/24 (2006.01) H02H 3/00 (2006.01)

Patent

CA 1063228

CIRCUIT BREAKER INCLUDING UNDERVOLTAGE RELEASE MECHANISM AND CONTROL CIRCUIT ABSTRACT OF THE DISCLOSURE A circuit breaker including a solid-state circuit for providing regulated current to operate a holding coil for an undervoltage release mechanism. An alternating current control line feeds a full wave bridge rectifier in the control circuit to provide pulsating direct current to a reference voltage supply circuit, a current regulating circuit, and the holding coil of an undervoltage release mechanism. The current regulating circuit comprises two series connected units of an integrated circuit quad current differential operational amplifier. The output of the second unit controls the base current of a regulating transis- tor which is series connected to the holding coil. The reference voltage supply circuit includes a transistor connected as a variable resistor to provide operation of the circuit over a wide range of input voltages without excessive heat generation.

255499

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